Exam (elaborations)
Wastewater Operator.
- Module
- EDPNA - technical
- Institution
- EDPNA - Technical
Wastewater Operator.
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Wastewater OperatorThe name of the State Agency responsible for enforcing pollution control laws in Texas is-
a. Texas Water Development Board
b. Texas Water Commission
c. Texas Section of EPA
d. Texas Commission on Environmental Quality
e. Texas Was Resource and Conservation Commission - correct answer-D Texas
Commission on Environmental Quality
The term pathogenic means-
a. Aerobic Bacteria
b. Anaerobic Bacteria
c. Fecal Matter
d. Coliform Bacteria
e. Capable of Causing Disease - correct answer-E. Capable of Causing Disease
The minimum separation between sewer lines and potable water lines is-
a. 5 feet
b. 7 feet
c. 9 feet
d. 11 feet
e. 24 feet - correct answer-C. 9 feet
A licensed wastewater operator is a professional who-
a. Consistently does the best job possible
b. Practices personal safety
c. Strives to improve job knowledge
d. Strives to keep the plant and collection system in the best appearance and working order
e. All of the above - correct answer-E. all of the above
An important step in testing a sample for Total Suspended Solids (TSS) is-
a. Settling the sample
b. Filtering the sample
c. Incubating the sample
d. Burning the sample
e. Evaporating the sample - correct answer-B. Filtering the sample
The Biochemical Oxygen Demand (BOD) of a sample is based on-
a. pH readings
,b. Measuring Total Suspended Solids (TSS) of a sample
c. Measuring the Dissolved Oxygen (DO) used
d. Measuring the anaerobic decomposition
e. Measuring total detention time - correct answer-C.Measuring the Dissolved Oxygen (DO)
used
The results of a Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells
the operator-
a. How the plant is currently operating
b. How the plant was operating 5 days ago
c. How the plant was operating 10 days ago
d. Is of no benefit to the operator
e. How the plant will be performing at TCEQ inspection time - correct answer-B How the
plant was operating 5 days ago
Which of the following are dangerous gases that are likely to be present in lift stations and or
manholes?
a. Natural gas and Gasoline fumes
b. Hydrogen Sulfide and Carbon Dioxide
c. Hydrogen, Sulfur, and Argon
d. Oxygen, Nitrogen and Helium
e. Both a & b - correct answer-E. Both a & b
A preferred hydraulic method of cleaning sewer lines is-
a. Cable & Argon
b. Continuous Roding Machine
c. Hydro Jet Cleaner
d. Bucket & Belt Press
e. Both a & d - correct answer-C. Hydro Jet Cleaner
Which of the following are ways to reduce bad odors coming from a collection system?
a. Aeration & Air Scrubbers
b. Adding Enzymes To The Collection System
c. Routinely cleaning slow running or low flow lines
d. Adding Chlorine or Hydrogen Peroxide to the Collection System
e. Both c & d - correct answer-E. Both c & d
Which of the following types of pipe are commonly used in a wastewater collection system?
a. Vitrified Clay
b. Poly Vinyl Chloride (PVC)
c. Ductile Iron
d. Stainless steel
e. Both a & b - correct answer-E. both a & b
,Before entering a confined space a worker should-
a. Use approved monitoring device and check for the presence of dangerous gases
b. Ventilate the space with a blower
c. Wear a safety harness and attach a life line
d. Enter the confined space even if another co-worker in not present
e. a, b, & c - correct answer-E. a,b, & c
A properly designed and operating primarily sedimentation tank should remove_____
percent of incoming BOD?
a. 10 to 15%
b. 20 to 30%
c. 30 to 40%
d. 35 to 50%
e. none of the above - correct answer-C. 30 to 40%
Which device may be used to determine the level of sewage in a lift station?
A. Air bubbler tube
B. Parshall Flume
C. Altitude Valve
D. Air Actuated Valve
E. All of the above - correct answer-A. Air bubbler tube
What is the most important role of aerobic bacteria in the treatment of wastewater? - correct
answer-Decompose organic matter
The hydraulic loading of a trickling filter may b determined by- - correct answer-Flow rate
and filter area
Which of the following is typically uses to dewatee sludge?
A. Belt press
B. Drying beds
C. Solid bowl centrifuge
D. Gravity thickened
E. All of the above - correct answer-E. all of the above.
Which of the following are the most important to providing adequate sewage treatment in a
stabilization pond?
A. Portozoa, rotifers, and turtles
B. Sunlight, algae, bacteria, and Time
C. Aeration, sedimentation, and Chlorine Contact
D. Nitrification, sedimentation, recircularion, & Detention
, E. Blowers, diffusers & Ultraviolet Disinfection - correct answer-B. Sunlight, algae, bacteria,
and time.
Offensive and objectionable odors which sometimes occur in trickling filters usually indicate
that-
A. The filter should he backwashed
B. The flow is too great for the filter area
C. Chlorinatior is not working properly & algae is growing on the media
D. Septic conditions are present
E. All of the above - correct answer-D. Septic conditions are present
Dissolved Oxygen (DO) in the aeration tank of an activated sludge plant should be
maintained at or about-
a. 1 to 2 mg/L
b. 2 to 3 mg/L
c. 2 to 4 mg/L
d. 4 to 6 mg/L
e. 0.5 to 0.75 mg/L - correct answer-C. 2 to 4 mg/L
Which of the following would contribute infiltration in a collection system?
a. Breaks in the main lines
b. High ground water levels
c. Heavy rains
d. Hydro jet cleaning plugged mains
e. A, B, & c. - correct answer-E. A, b, & c.
When a centrifugal pump loses prime, which of the folowing is most likely to result?
a. Pump sounds as through it is pumping gravel
b. Pump is no longer moving liquid
c. Check valve on the suction side of the pump slams closes
d. RPM of motor increases to compensate
e. A, b, & C - correct answer-B. Pump is no longer moving liquid
A Rotating Biological Contactor (RBC) is-
a. Fixed film biological treatment process
b. Addition to most Activated Sludge Plants
c. New filter media aerobic digester
d. Variable speed Recirculating Biological Contact Unit
e. Reconditioned Biological Containment Unit - correct answer-A. fixed film biological
treatment process
Which of the following need to be checked regularly to properly operate an activated sludge
treatment plant?
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